Html – How to POST input type date to MVC controller

I'm having trouble posting date value from MVC Razor view to MVC Controller

HTML

@using (Html.BeginForm("MainframeFilingDetail", "Report", FormMethod.Post,     htmlAttributes: new { @class = "form-inline", id = "formDetails" }))
{
<div class="form-group">
    <label id="ReportBeginDate">Report Begin Date</label>
    <input type="date" id="BeginDate" value="@DateTime.Today.ToString("yyyy-MM-dd")"/>
</div>

    <div class="form-group">
        <label id="ReportEndDate">Report End Date</label>
        <input type="date" id="EndDate"  value="@DateTime.Today.ToString("yyyy-MM-dd")"/>
    </div>

    <input id="submit" type="submit" value="Submit" class="btn btn-primary pull-right"/>

}

MVC Controller

[HttpPost]
public ActionResult MainframeFilingDetail(DateTime beginDate, DateTime endDate)
{
    var isValidDate = ValidateDate(beginDate, endDate);
    if(!isValidDate)
    {
        ModelState.AddModelError("", "Invalid Date!");
    }

    var mainframeData = GetMainframeData();


    return View(mainframeData);
}

Question

When I click the submit button I get exception although I have default value in date input type. I cannot have null values passed to the controller.

The parameters dictionary contains a null entry for parameter
'beginDate' of non-nullable type 'System.DateTime' for method
'System.Web.Mvc.ActionResult MainframeFilingDetail(System.DateTime,
System.DateTime)' in
'SOS.BusinessFilings.Web.Int.Controllers.ReportController'. An
optional parameter must be a reference type, a nullable type, or be
declared as an optional parameter. Parameter name: parameters